Abstract
BackgroundA three-dimensional simulation has been conducted to study the impact of the hydrophobicity of surfaces on heat transfer, hydrodynamics, and entropy generation of a non-Newtonian nanofluid in a wavy microchannel. MethodsThe hybrid nanofluid is composed of ethylene glycol/MWCNTs-Fe3O4, and the wavy surface is under a constant heat flux. The main parameters that have been studied in this research are 10≤ Re ≤150, 1.25% ≤ φ ≤1.8%, and 0 ≤ β* ≤0.1. The effects of the mentioned parameters during the research on velocity and temperature distribution, forced convection, pressure drop, and entropy generation have been investigated in detail. The outcomes indicated that using hydrophobic boundary conditions leads to an increase in heat transfer and a decrease in pressure losses, which is useful for the efficiency of cooling systems. The results also show that although increasing the volume fraction of nano-additives and Reynolds number leads to an increment in cooling, they also increase the pressure drop. Significant findingsThe PEC and relative entropy generation results are studied for finding the optimized points.
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